Abrading machine



May 18, 1937 G. N. GoDoN 2,080,538

ABRADING MACHINE Y Filed Jan. 51, 1956 70 /mao 721 l 54 @4 J l. 86 n4 L s )Il l 60 76 78 VEN TUI@ Patented May 1s, 1937' UNITED STATES PATENT OFFICE ABRADING MACHINE George N. Gordon,

Brockton, Mass., assignor to Application `anuary 31, 1936, Serial No. 61,771

11 Claims.

This invention relates to abrading machines and is herein illustrated as embodied in a machine for roughening channels and channel flaps formed on shoe parts. For an example of a ma- Chine of this type, reference may be made to United States Letters Patent No. 2,004,109, granted June 11, 1935 in the name of John B. Hadaway. This patent discloses a machine comprising a pair of rotary scouring brushes arranged lo coaxially for scouring channels and channel flaps, respectively.

It is an object of the present invention to provide an improved machine of the type under consideration. In accordance with a feature of the invention a pair of rotary scouring tools are arranged adjacent to each other and in substantially coaxial relation for scouring channels and channel flaps, respectively, the supporting means for the tool which operates on the channel flaps being yieldable to avoid any danger of excessive pressure causing the tool to scour through the relatively thin material of the flaps. As illustrated herein the tool which operates upon the channel is mounted upon a relatively rigid shaft.

' operates upon the channel iiap is mounted upon a yieldable member which constitutes an extension of the rigid shaft.

These and other features of the invention including certain details of construction and combinations of parts will be described in connection with the illustrated machine and pointed out in the appended claims.

Referring now to the accompanying drawing,

Fig. 1 is a view in side elevation of the operat- 35 ing instrumentalities of the machine;

Fig. 2 is a view similar to Fig. l of a modification; and

Fig. 3 is a sectional view taken on the line III-III of Fig. 2.

40 Mounted upon a driven shaft IIJ which rotates in a xed bearing I2 is a scouring tool I4 comprising a plurality of wire bristles assembled upon a core I6 which, in turn, is mounted upon a hub I8. 'I'he bristles are confined between a disk 20 45 which is secured to the hub I8 and a flange 22 extending from the hub I8. The hub I8 is nonrotatably secured to the shaft I0 by a set screw 24. An axial bore 26 is formed in the end portion of the shaft I0 and slidably fitted within the bore 26 is a block 28 having a longitudinal slot 30 through which extends a pin 32 secured in the shaft I0. The pin 32 in the slot 30 insures rotation of the block 28 with the shaft I0 while providing some degree of freedom of relative axial 55 movement of the block 28 within the shaft I0. A

exible shaft 34 has one of its ends secured to the block 28, the diameter of the shaft 34 being considerably less than that of the bore 26. The shaft 34 extends outwardly through the bore 26 beyond the end of the shaft I0, the opposite end of the shaft 34 being supported in a socket 36 carried by a stationary member 38 which may be secured to any convenient portion of the machine frame. Mounted upon the shaft 34 is a scouring tool 40 comprising a plurality of wire bristles secured upon a core 42 which is mounted upon a hub 44. The bristles are confined between a plate 46 which is secured to the hub 44 and a flange 48 extending from the hub 44. The hub 44 is nonrotatably secured to the shaft 34 by a set screw 50. The hubs 44 and I8 are secured upon their respective shafts in such positions as to bring the plates 46 and 20 substantially into engagement.

The scouring tool I4 is cylindrical and is intended to operate upon the base of a channel, while the scouring tool 40 is frusto-conical in form and is intended to operate upon the upturned flap. A supporting finger 52 is normally urged toward the scouring tool 40 and against an adjustable stop by a spring to support the channel iiap against the scouring tool. The linger 52 may be retracted by a treadle mechanism for the purpose of inserting a new work piece. 'I'he finger 52, together with its operating mechanism, and the driving means for the shaft I0 are all similar to the corresponding members illustrated and described in the above-mentioned Letters Patent No. 2,004,109, to which reference may be had for a more complete understanding of the same.

In the operation of the machine a shoe S having a channel ap F is presented to the scouring tools in such a manner as to bring the inner surface of the flap F against the scouring tool 40 while the scouring tool I4 operates upon the base of the channel. The flap F is supported against the tool 40 by the nger 52. If the flap F should present any irregularities, for example if it should have dried out of temper so as to be warped and relatively stiff, the brush 40 will yield relatively to the brush I4 thereby avoiding any danger of scouring through the thin liap F. Such yielding takes place in the flexible shaft 34 which, as already pointed out, is smaller in diameter than the bore 26. The pressure of the tool 46 against the work will be substantially equivalent to the weight of the tool. This pressure will be modified, to a slight extent, by the tendency of the shaft 34 to straighten, such shafts being usually somewhat resilient. The maximum dis- 2 placement of the tool 40 is limited by the difference in diameters between the bore 26 and the shaft 34. When the tool 4U is in coaxial relation to the shaft I6 the shaft 34 will be substantially iny endwise engagement with the base of the socket 36 and the inner end of the slot 30 will be substantially in engagement with the pin 32, provision being made for reasonable clearance. As the shaft 34 yields it will shorten slightly and such shortening will be accommodated by the socket 36 and by the slot 30. The disks 46 and 26 not only prevent the crinkled bristles of the respective brushes from becoming entangled with each other, but also confine the bristles of each brush against their exert pressure against the other brush. There will therefore be no appreciable friction between the disks 46 and 20. The disk 46 will engage the disk 20 over a considerable area and will thus maintain the axis of the tool 40 always parallel to the axis of the shaft I8 regardless of the radial displacement of the tool 40. The disk 20 is of less diameter than the periphery of the scouring tool I4, that is, it does not extend outwardly as far as the ends of the bristles and does not bear against the base of the channel. Its marginal portion, however, bears againstthe base of the flap F and thus positions the shoe laterally with respect to the scouring tools. The disk 46 is of less diameter than the disk 20, sufficient clearance being provided to prevent the disk 46 from contacting with the ilap F under conditions of maximum downward displacement of the scouring tool 40. v

A modified arrangement is shown in Figs. 2 and 3. In this modification the driven shaft IIJ has formed in its end portion an axial bore 54. Within the bore 54 is a universal coupling one element of which, indicated by the reference character 56, is threaded directly into the shaft I0 at the base of the bore 54. The threads of the member 56 are so directed as to cause tightening rather than loosening as the shaft I0 is driven. The other element of the universal coupling constitutes the end of a tubular shaft 58. The coupling is of a well-known type for transmitting rotation while permitting universal pivotal movement between the two elements. Slidably mounted within the shaft 58 is a shaft 68 the outerend of which is connected through a universal coupling similar to that already described to a shaft 62. Relative rotation between the shaft 60 and the shaft 58 is prevented by a slot and key arrangement indicated by the reference character 64. The shaft 62 is mounted inY a bearing 64 which is carried by a slide block 66 guided for vertical movement in a slot 68 formed in a stationary bracket 10 which may be supported by any convenient portion of the machine frame. A bridge 12 extends across the lower open end of the slot 68 and prevents the block 66 from falling out of the slot. The lowermost position of the block 66 is adjustably determined by a stop screw 14 threaded through the bridge 12. ,The screw 14 has a cone-shaped end 16 which engages an inclined portion 18 of the block 66. A binding screw is provided for holding the adjusting screw 14 in adjusted position. Mounted fixedly upon the shaft I0 is a scouring tool 82 identical in all respects with the scouring tool I4. Mounted on the shaft 62 is a scouring tool 84 similar to the scouring tool 40 except for the fact that it is not secured to the shaft 62 by a set screw but is held against relative rotary movement by a key and slot arrangement BIS-which permits relative tendency to spread andV axial movement of the tool 84 on the shaft 62. Such movement is limited in one directionby engagement of the plate 46 of the tool B4 with the plate 20 of the scouring tool 82 and in the opposite direction by the engagement of the hub of the tool 84 with one of the rotary elements of the bearing 64. The endwise clearance thus provided for the tool 84 need be only enough to avoid binding the tool 84 against the tool 82, leaving the tool 84 free to move vertically. The weight of the tool 84, together with the portions which move vertically therewith, may be partially compensated for by a compression spring 88 surrounding a screw 90 which is threaded into the block 66. The spring 88 is interposed between the head of the screw 90 and a lug extending from the bracket 10. The screw 90 enables the compensating effect of the spring 88 to be adjusted. The operation of this form of the machine is the same as the operation of the machine already described and illustrated in Fig. 1. By reason of the shaft 62 being positively held against tilting movement by the bearing 64 the axis of the tool 84 will always be kept parallel to the axis of the shaft l regardless of vertical displacement. is so positioned that the tool 84 in its neutral position Will be coaxial with the tool 82.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. A machine for roughing shoe parts and like articles, comprising a rotary roughing tool, a driven shaft upon which said tool isV mounted, a support for said shaft, said shaftfbeing yieldable relatively to said suppport to avoid excessive pressure against the work, and mean for maintaining the axis of said tool in a predetermined direction. l

2. A machine forroughng shoe parts and like articles, comprising a rotary wire scouring brush,

a driven shaft upon which said brush is mounted, a support for said shaft on each side of said brush, said shaft being yieldable relatively to said supports to avoid excessive pressure against the work, and means for maintaining the axis of said brush in a predetermined direction.

3. A machine for roughing channels and channel flaps formed upon shoe parts, comprising a pair of driven rotary scouring tools adjacent to each other and in substantially co-axial relation for scouring channels and channel aps respectively, and supporting means for said tools constructed and arranged foryielding movement` of the tool which operates on the channel flap relatively to the tool which operates on the channel to avoid excessive pressure against the channel flap. Y.'

The slot 68V 4. A machine for roughing channelsand channel flaps formed upon shoe parts, comprising a relatively rigid driven shaft, a wire scouring brush mounted upon said shaft for roughing channels, a yieldable member. driven by said shaft, and a wire scouring brush" mounted `upon said yieldable member in proximityfto the first mentioned brush for roughing channel flap's.

5. A machine for roughing channels and channel flaps formed upon shoe parts, comprising a relatively. rigid driven shaft, a scouring tool mounted upon said shaft for roughing channels, a yieldable shaft keyed at one end to the rigid shaft and extending beyond the end of the rigid shaft, a bearing for the opposite end of said yieldable shaft, and a scouring tool mounted upon said yieldable shaft adjacent to the flrstrmentioned scouring tool for roughing channel flaps.

6. A machine for roughing channels and channel naps formed upon shoe parts, comprising a relatively rigid driven shaft having an, axial recess in one of its ends, a scouring tool mounted on said shaft at said end for roughing channels, a flexible shaft having one end slidably keyed within said recess, a socket for supporting the other end of said flexible shaft, said socket and said recess being constructed and arranged to provide a limited freedom of endwise movement of said flexible shaft, and a scouring tool mounted upon said exible shaft adjacent to the first mentioned scouring tool for roughing channel naps.

7. A machine for roughing channels and chan- Y nel flaps formed upon shoe parts, comprising a relatively rigid driven shaft, a scouring brush mounted upon said shaft for roughing channels, a yieldable shaft extending from and driven by 20 said rigid shaft, a scouring brush mounted upon said yieldable shaft adjacent to the first mentioned scouring brush for roughing channel flaps, and a disk interposed between said brushes to prevent the bristles of the respective brushes 25 from becoming entangled with each other, said disk being constructed and arranged also to gage the Work in relation to the scouring brushes.

8. Anl abrading machine comprising a substantially rigid shaft having a yieldable extension, and a pair of rotary abrading tools mounted adjacent to each other upon the rigid portion of the shaft and upon the yieldable extension respectively.

9. An abrading machine comprising a pair of rotary scouring brushes adjacent to and in substantially coaxial relation to each other, driving and supporting means for* said brushes constructed and arranged to render one of said brushes yieldable relatively to the other under pressure of the Work, and means interposed between said brushes for preventing the bristles of either brush from becoming ent-angled with the bristles of the other brush.

10. In a machine of the class described, an abrading tool, a rigid shaft supporting and driving said abrading tool, a second abrading tool adjacent to the first-mentioned abrading tool, and a yieldable extension from said shaft to the second-mentioned abrading tool for driving the second-mentioned abrading tool.

11. In a machine of the class described, a rotary abrading tool, a driven flexible shaft upon which said abrading tool is mounted, and a support for said shaft on each side of said tool.

GEORGE N. GORDON. 

